Overview - Coolant Pump/Coolant Thermostat

Fig 1: Coolant Pump/Coolant Thermostat Exploded View

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

1. Coolant Thermostat Housing
   • Pay attention to the tightening sequence on the coolant pump. Refer to COOLANT PUMP, REMOVING AND INSTALLING 
   • Removing and installing. Refer to COOLANT THERMOSTAT, REMOVING AND INSTALLING .
2. Coolant Thermostat
   • For the cylinder block coolant circuit
   • Starts to open at approximately 97 to 105 °C (206.6 to 221 °F)
   • There are different versions.
   • Removing and Installing. Refer to COOLANT THERMOSTAT, REMOVING AND INSTALLING .
3. Seal
   • Replace after removing.
   • Coat with coolant before installing
4. Coolant Pump
   • Removing and installing. Refer to COOLANT PUMP, REMOVING AND INSTALLING .
   • Replace the toothed belt also if replacing the coolant pump
5. Bolt
   • Thread cutting
   • Position the bolt by hand and tighten it until it finds the old threads. Then tighten the bolt to the tightening specification.
   • Tightening specification and sequence. Refer to Fig 3.
6. Seal
   • Replace after removing.
   • Make sure the seal is seated correctly.
   • Coat with coolant before installing
7. Toothed Belt Guard
   • For the coolant pump toothed belt
8. Bolt
   • 20 Nm +90°
   • Replace after removing.
9. O-ring
   • Not Installed
10. Toothed Belt
    • Replace the toothed belt also if replacing the coolant pump
    • For the coolant pump
11. Toothed Belt Sprocket
    • For the coolant pump
    • Removing and installing. Refer to COOLANT PUMP TOOTHED BELT SPROCKET, REMOVING AND INSTALLING .
12. Bolt
    • 8 Nm
13. Bolt
    • Thread cutting
    • Position the bolt by hand and tighten it until it finds the old threads. Then tighten the bolt to the specification.
    • Tightening specification and sequence. Refer to Fig 4.
14. Cap
    • For the coolant thermostat
15. Seal
    • Replace after removing.
16. Coolant Thermostat
    • For main coolant circuit (radiator)
    • Through 11/2012: begins opening at approximately 80 °C (176 °F)
    • From 11/2012: begins opening at approximately 87 °C (188.6 °F)
    • Removing and Installing. Refer to COOLANT THERMOSTAT, REMOVING AND INSTALLING .
    • Installation position. Refer to Fig 2.
17. Bolt
    • Tightening specification and sequence. Refer to Installing .

Fig 2: Locating Coolant Thermostat Installed Location

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

• Must fit in the thermostat housing with the centering pin inside the guide -arrow-.

Fig 3: Tightening Sequence For Thermostat Housing To Coolant Pump

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Tighten bolts in the sequence -A through F-.

Fig 4: Tightening Sequence

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Tighten the bolts for the cover -1- in the sequence -A through D-.